US Regional Images

The US regional images are available for 19 regions plus a CONUS view. There
are four types of images:

Visible

Visible images are shown in a gray shading where brightness shows the
amount of sunlight reflected back. Values run from 0 to 100.

Infrared Gray

Gray scale IR images show surface temperature values whether it be the ocean,
land or a cloud. The scale shows temperature values starting at -70C (white)
and going to 30C (black).

Infrared Color

This is similar to the gray scale image except it uses a rainbow style
color table starting at magenta (-70C) to blue (-45C) to green (-20C) to
yellow (-5C) to orange (5C) to red (20C).

Water Vapor

Even though the water vapor channel is in the infrared and thus returns a
temperature value. But typcally the WV values relate to the depth into the
atmosphere until you hit water vapor. Greens are blue show high clouds
whereas dark gray and red are near ground surface.

The images are generated every 30 minutes and can be looped.

International Images

The international images are presented for 12 ICAO regions. There are just
two types of images: infrared gray and infrared color. Some regions are updated
every 30 minutes. Regions that contain Europe are restricted to every 6
hours by international agreement. By default, the latest image is shown
but older images can be displayed through an animated loop.